"jchen0516" wrote : We found a problem on JMS. I am not sure if it is my
configuration problem. I wrote a simple MDB. At client side, when I put a small
size ObjectMessage into the queue, MDB works fine. Only one MDB pickups and
processes the message for one time. However, when I put a big size
ObjectMessage (~MB) into the queue and MDB needs to process a little longer for
a message, I found there are serveral MDB which sequentially pick up the same
message from the queue and process it. I wonder if I should set something for
message persistence to solve this problem.
|
| btw, jboss is running on a linux environment. I can see many same session
pool message for MeesageDriverBean. Does that multithread or multi-CPU cause
the problem? But I doubt because it is running fine for the small size message.
|
| Thanks for your help in advance!
|
| ----------------------------------------------------
| This is the my-jbossmq-destinations-service.xml in
jboss-4.0.2/server/default/deploy/jms directory
|
|
|
| mbean code="org.jboss.mq.server.jmx.Queue"
| name="jboss.mq.destination:service=Queue,name=myQueue"
| <depends
optional-attribute-name="DestinationManager">jboss.mq:service=DestinationManager
| /mbean>
|
|
| ----------------------------------------------------------
| MDB is very simple. ZippingMessage contains a list of filename need to be
zipped. When ZippingMessage is bigger, this MDB needs to process longer time on
zipping.
|
| public void onMessage(Message arg0) {
|
| // TODO Auto-generated method stub
| try {
|
| ObjectMessage om = (ObjectMessage) arg0;
| ZippingMessage izm = (ZippingMessage) om.getObject();
|
| // start zipping and wait it finished
| ZipManager zipper = new ZipManager();
| zipper.setName(izm.getZipFilename());
| zipper.setFiles(izm.getItems());
| zipper.start();
| zipper.join();
|
| } catch (Exception e) {
| log.error("Unexpected exception: " + e.getMessage());
| }
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